restore composer.json, add mysqli extension

public/vendor/editor/config/common/scss.config.js

@@ -0,0 +1,22 @@
+const MiniCssExtractPlugin = require('mini-css-extract-plugin');
+
+module.exports = {
+  test: /\.(sa|sc|c)ss$/,
+  use: [
+    {
+      loader: MiniCssExtractPlugin.loader,
+    },
+    {
+      loader: 'css-loader',
+    },
+    {
+      loader: 'postcss-loader',
+    },
+    {
+      loader: 'sass-loader',
+      options: {
+        implementation: require('sass'),
+      },
+    },
+  ],
+};